MDT1020 Datasheet, PDF (4/18 Pages) Micon Design Technology Corporation – 8-bit micro-controller

(3) PC (Program Counter) : R2
MDT1020
Write PC, CALL --- always 0
LJUMP, JUMP, LCALL --- from instruction word
RTWI, RET --- from STACK
A10
A9
A8
A7~A0
Write PC, JUMP, CALL --- from SATUS b6 b5
LJUMP, LCALL --- from instruction word
RTWI, RET --- from STACK
Write PC --- from ALU
LJUMP, JUMP, LCALL, CALL --- from instruction word
RTWI, RET --- from STACK
(4) STATUS (Status register) : R3
Bit
0
1
2
3
4
65
7
Symbol
C
HC
Z
PF
TF
page
Function
Carry bit
Half Carry bit
Zero bit
Power loss Flag bit
Time overflow Flag bit
Page select bit :
00 : 000H --- 1FFH
01 : 200H --- 3FFH
10 : 400H --- 5FFH
11 : 600H --- 7FFH
General purpose bits
This specification are subject to be changed without notice. Any latest information please preview
http;//www.mdtic.com.tw
P.4
2005/6 Ver1.4